Consulting the Codex…
RS3 · Skills · Activities · Quests
The Codex keeps its readings for 400 days, so you can go back that far, to the first day it read FreezeDK1997.
Herblore 76 → 96, 8.3m XP
Prayer 81 → 95, 6.4m XP
Summoning 94 → 96, 922k XPWeakest area: Potions. Herblore 76 → 96, 8.3m XP. Quests need a public profile, so the quest checks are left out of the score.